Two-step synthesis process

Figure 1 provides an overview of the two step synthesis process, pioneered by Allcock (4) and In use today by a number of workers and laboratories formation of a soluble reactive polymer Intermediate (II) from which is derived a large number of polymers via substitution reactions. 

The two-step synthesis process shown in Figure 2 affords several possibilities for preparing new side-chain liquid crystal polymers. The polymerization process allows one to vary the molecular weight and molecular weight distribution (MWD), and potentially change the properties of the liquid crystalline state. Most of the polyphosphazenes reported in the literature, including the examples in this paper, are derived from the bulk uncatalyzed process this... 

The breakthrough of shape-controlled synthesis of Pt nanoparticles of high-energy surface has been made by Tian et al. at Xiamen University in 2007. They have developed a two-step synthesis process as illustrated in Fig. 5A. The first step is electrodeposition of polycrystalline Pt nanospheres 750nm in diameter on glassy carbon (GC) substrate. The Pt nanospheres are then subjected to a square-wave potential treatment in a solution containing 0.1 M H2SO4 and 30 mM ascorbic acid, where they become partially... 

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